Sandy, for a brief moment, bought it completely, lowering his knives. Here was just a harmless old pony, down on his luck, maybe just finding a place to rest for the night. In an abandoned building. With blackout curtains that make it seem like night in hereeeeokay the knives are back up now.
If he didn't get jumped, he glared sternly at the earth pony. "Open your mouth and let's see them teeth." he said firmly, but made no move to attack. He did nudge the curtains open to try and get some grade-A sunlight on this pony.